Drafting arrangement for spinning machines



p 25, 2 A. SCHILTKNECHT 3,055,060

DRAFTING ARRANGEMENT FOR SPINNING MACHINES Filed Nov. 27. 19.59 2 Sheets-Sheet 1 Sept. 25, 1962 A. $HILTKNECHT 3,055,060

DRAE'TING ARRANGEMENT FOR SPINNING MACHINES Filed NOV. 27. 1959 I 2 Sheets-Shet 2 United States Patent 3,055,060 DRAFTING ARRANGEMENT FOR SPINNING MACHINES Adolf Schiltknecht, Winterthur, Switzerland, assignor to Actiengesellschaft Joh. Jacob Rieter & Cie., Winterthur, Switzerland, a corporation of Switzerland Filed Nov. 27, 1959, Ser. No. 855,781 Claims priority, application Switzerland Dec. 5, 1958 3 Claims. (Cl. 19253) The present invention relates to a drafting arrangement for spinning machines which serves for working shortas well as long-stapled fibrous material.

Long-staple drafting arrangements are known in which the guide rail for reversing the lower apron is rearwardly extended so that a substantial portion of the fibre carrying run of the apron is supported from below. Such rearwardly extended guide rails cannot be used in drafting arrangements intended to process shortas well as longstapled fibres, demanding a quick change of the length of the drafting field.

It is an object of the present invention to provide a drafting arrangement having a drafting field defined by two pairs of rollers, each pair including a drafting roller and a top roller whereby one of the drafting rollers is carried in a support whose position can be changed longitudinally of the drafting field and which roller is partly surrounded by a lower apron for driving the apron, an apron reversing guide rail being provided adjacent to the second drafting roller and adapted to be conveniently lifted out of the drafting frame, and a guide rail for supporting the lower apron being provided adjacent to the driven drafting roller, the last mentioned guide rail resting on the support for the driving roller and being conveniently liftable out of said support.

The advantage of the aforedescribed arrangement is the convenient and quick changeability of the drafting field from long-staple drafting position to short-staple drafting position and vice versa.

The novel features which are considered characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however, and additional objects and advantages thereof will best be understood from the following description of an embodiment thereof when read in connection with the accompanying drawing, in which:

FIG. 1 is a diagrammatic cross sectional view of a drafting arrangement according to the invention in position for drafting long-stapled fibres, the section being made along line I-I in FIG. 2.

FIG. 2 is a plan view of a portion of the drafting arrangement.

FIG. 3 is a cross sectional view of the drafting arrangement adjusted to work short-stapled fibres.

Referring more particularly to the drawing, numeral 1 designates a delivery roller which is rotatable in a bearing slot 2 provided in a part 3 of the machine. A drafting roller 4 at the rear end of the drafting field is rotatable in a bearing slot 5 in a support 6 which is adjustably connected to the support part 3 for changing the position of the support and of the roller 4 longitudinally of the drafting field. A reversing guide rail 8 for a lower apron 9 is placed in close proximity to the drafting roller 1 and has a foot portion resting in a slot 7 of the part 3 so that the rail 8 can be conveniently lifted out of the slot 7. The rail or bar 8 diverts the apron 9 towards a tension roller 11 which is swingable on a part 10 of the machine frame. The apron 9 runs from the tension roller 11 upwards onto and partly surrounds the drafting roller 4 to be driven thereby. A second guide rail 12 which preferably has the same cross sectional configuration as the rail 8 has a portion resting in slots 13' and 13 of extensions 18 and 19, respectively, of the support 6. The rail or bar 12 can be easily lifted out of the slots 13 and 13', by hand. It will be noted that the parts of the rails 8 and 12 extending into the slots 7 and 13 have the same cross sectional configuration so that the rails are interchangeable. If desired, the portions of the rails 8 and 12 which are in contact with the inside of the lower apron may have a different cross sectional configuration.

The part 3 is provided with lateral recesses 14 and 15 (FIG. 2) which are placed directly in the rear of the drafting roller 1 and lateral of the slot 7. The rear ends of the recesses 14 and 15, i.e., the portions thereof facing the adjustable support 6 are open.

The forward inside wall and the bottom of the recesses 14 and 15 form cylindrical surfaces 16 and 16, respectively, which surfaces are placed normal to the vertical inside surfaces 17 and 17 of the recesses 14 and 15. The extensions 18 and 19 of the adjustable support 6 are so shaped as to fit into the recesses 15 and 14, respectively. The forward and bottom surface of the extensions 18 and 19 have a cylindrical configuration 20 corresponding to the bottom surfaces 16 and 16' of the recesses 15 and 14.

The aforedescribed structure permits to move the adjustable support 6 and the drafting roller 4 forward until the rail 12 abuts against the rail 8. If it is desired to make the drafting field still shorter, the reversing rail 12 is removed and the support 6 is moved forward to the position indicated by dash-dot lines in FIG. 1. A still shorter drafting field can be obtained by removing the reversing rail 8 and moving the support 6 to the position shown in FIG. 3 in which the slots 13 and 13 of extensions 19 and 18 are laterally juxtaposed to and aligned with the slot 7 of the part 3 so that the reversing rail 8 can be placed in the aligned slots 13, 7, 13'.

I claim:

1. A drafting arrangement comprising a first and a second roller pair defining a drafting field, each roller pair including a drafting roller and a top roller, a supporting part supporting the drafting roller of the second roller pair, an adjustable support, the drafting roller of the first roller pair resting on said adjustable support, the latter being adjustably connected to said supporting part for changing the position of said adjustable support and of the drafting roller of the first roller pair in a direction longitudinally of the drafting field, a lower apron partly surrounding the drafting roller of the first roller pair to be driven thereby, an apron reversing guide rail having a foot portion extending parallel to the apron and transversely of the drafting field and removably received in a corresponding slot in said supporting part in the vicinity of the drafting roller of the second roller pair, and a guide rail placed below the run of said apron running from the drafting roller of the first roller pair to said apron reversing guide rail for supporting the apron, the last mentioned guide rail having a foot portion extending parallel to the apron and transversely of the drafting field and removably received in a corresponding slot in said adjustable support, the foot portions of both guide rails being alike for permitting interchange of said guide rails.

2. A drafting arrangement as defined in claim 1 where- Patented Sept. 25, 1962 in said supporting part and said adjustable support individually have a carrying portion, said slots being in said carrying portions, one of said carrying portions having at least one recess extending longitudinally of the drafting field and the other carrying portion being in the form of an extension extending longitudinally of the drafting field and shaped to fit into said recess for afiording close placing of said drafting rollers.

3. A drafting arrangement according to claim 2 wherein said slot in one of said carrying portions is laterally juxtaposed to and in line with the slot in said extension for jointly receiving the foot portion of one guide rail, when said extension is fully inserted in said recess.

References Cited in the file of this patent UNITED STATES PATENTS 2,756,462 Love et al. July 31, 1956 

